var createError = require("http-errors");
var express = require("express");
var path = require("path");
var cookieParser = require("cookie-parser");
var logger = require("morgan");

var bodyParser = require("body-parser");
var indexRouter = require("./routes/index");
var usersRouter = require("./routes/users");
var app = express();

// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "jade");

app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, "public")));

/**
 * url解析 start
 */
app.use(bodyParser.urlencoded({ extended: false })); //extended为false表示使用querystring来解析数据，这是URL-encoded解析器
// parse application/json
app.use(bodyParser.json()); //添加json解析器
/**
 * url解析 end
 */
app.use("/", indexRouter);
app.use("/users", usersRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get("env") === "development" ? err : {};
  // render the error page
  res.status(err.status || 500);
  res.render("error");
});
app.all("*", function (req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "X-Requested-With");
  res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
  res.header("X-Powered-By", "3.2.1");
  res.header("Content-Type", "application/json;charset=utf-8");
  next();
});
module.exports = app;
